Q1. A copper wire is held between the poles of a magnet. If the wire is moved upwards, an induced current is observed. What happens if the wire is moved downwards with the same speed?A The induced current will be in the opposite direction. B The current will increase. C The induced current will be in the same direction. D No current will be induced. View full solution →
Q2. What is the purpose of the insulated covering on electric wires?A To make the wires look aesthetically pleasing. B To reduce the resistance of the wire. C To prevent electric shocks and short-circuiting. D To increase the flexibility of the wire. View full solution →
Q3. A compass needle is placed on a table. A current-carrying wire is brought directly above the compass needle. If the current flows from west to east, what will be the direction of deflection of the north pole of the compass?A Towards West B Towards East C Towards South D Towards North View full solution →
Q4. What kind of magnetic field is produced by a current-carrying circular loop at its center?A Uniform and parallel to the loop's plane. B Concentric circles around the loop. C Non-uniform and diverging. D Straight and perpendicular to the loop's plane. View full solution →
Q5. An electric current is flowing in a straight conductor from north to south. What is the direction of the magnetic field lines when viewed from a point directly below the conductor?A Clockwise B East to West C West to East D Anticlockwise View full solution →
Q6. A permanent magnet is used in a galvanometer. What is the role of this magnet?A To induce current in the coil. B To convert electrical energy to mechanical energy. C To provide a strong and uniform magnetic field. D To reduce the resistance of the coil. View full solution →
Q7. An electric motor's armature current is increased. What is the effect on its output mechanical power?A It increases. B It decreases. C It first increases then stabilizes. D It remains the same. View full solution →
Q8. Two straight, parallel conductors carry current in opposite directions. Describe the force between them.A Repulsive force. B Attractive force. C No force. D Force direction alternates. View full solution →
Q9. A proton enters a uniform magnetic field directed into the page. If the proton's velocity is to the right, what is the direction of the magnetic force on the proton?A Into the page B Out of the page C Downwards D Upwards View full solution →
Q10. A compass needle is placed near a current-carrying straight conductor. If the direction of current in the conductor is reversed, what will be the effect on the compass needle?A It will show decreased deflection. B It will show increased deflection. C It will deflect in the opposite direction. D It will not deflect at all. View full solution →
Q11. Which of the following determines the direction of the magnetic field produced by a straight current-carrying conductor?A Fleming's Right-Hand Rule B Lenz's Law C Right-Hand Thumb Rule D Fleming's Left-Hand Rule View full solution →
Q12. If an electron beam is directed horizontally towards the north and enters a magnetic field pointing vertically downwards, what will be the direction of deflection of the electron beam?A West B South C East D North View full solution →
Q13. How can the speed of rotation of a DC electric motor be increased?A By increasing the resistance of the coil. B By using a weaker magnetic field. C By increasing the number of turns in the coil. D By decreasing the current in the coil. View full solution →
Q14. How does increasing the number of turns in the coil of an electromagnet affect its strength?A The strength first increases then decreases. B The strength increases. C The strength decreases. D The strength remains the same. View full solution →
Q15. How does the strength of the magnetic field inside a current-carrying solenoid change if the number of turns per unit length is doubled, keeping the current constant?A It becomes four times. B It becomes half. C It becomes double. D It remains the same. View full solution →
Q16. Consider a current loop placed in a uniform magnetic field. Under what conditions will the loop experience a net force?A A current loop in a uniform magnetic field never experiences a net force. B Only when the plane of the loop is perpendicular to the magnetic field. C When the magnetic field is non-uniform. D Only when the plane of the loop is parallel to the magnetic field. View full solution →
Q17. Why is the current in the neutral wire usually zero when all appliances in a domestic circuit are switched off?A Because no current is drawn from the live wire. B Because the fuse breaks the circuit. C Because the neutral wire is always earthed. D Because the voltage becomes zero. View full solution →
Q18. What is the primary function of a circuit breaker?A To automatically stop the flow of electricity during overcurrent conditions. B To regulate voltage in a circuit. C To convert AC to DC. D To prevent current from flowing in a circuit. View full solution →
Q19. A wire loop is moved away from a current-carrying solenoid. In which direction will the induced current flow in the loop, if the solenoid's current creates a North pole on the side facing the loop?A Current direction cannot be determined. B No current induced C Anticlockwise D Clockwise View full solution →
Q20. Which type of generator is used to produce electricity for most household and industrial purposes?A AC generator with commutator. B DC generator with slip rings. C DC generator with commutator. D AC generator with slip rings. View full solution →